Characterization and Photocatalytic Activity of Mixed Nanocrystalline TiO_2 Powders Prepared by Xerogel-Hydrothermal Method in Different Acid Solutions  

作　　者：Liu Cuiping Yu Tao Tan Xin 刘翠萍;于涛;谭欣

机构地区：[1]School of Chemical Engineering and Technology, Tianjin University [2]School of Science, Tianjin Chengjian University [3]School of Science, Tibet University

出　　处：《Transactions of Tianjin University》2016年第5期473-479,共7页天津大学学报（英文版）

基　　金：Supported by the National Basic Research Program of China("973"Program,No.2014CB239300,No.2012CB720100);National Natural Science Foundation of China(No.21406164,No.21466035)

摘　　要：TiO_2 nanoparticles(NPs)were prepared via the hydrothermal route of TiO_2 xerogel in nitric acid, hydrochloric acid and acetic acid. The physico-chemical properties of the powders were characterized by X-ray diffraction(XRD)and N_2 adsorption desorption techniques. The effects of the different acids on the structure(crystal phase)and texture(primary particle size and porosity)of the TiO_2 powders were explored. Results indicated that acetic acid facilitated the formation and stability of pure anatase phase. On the other hand, nitric acid and hydrochloric acid led to the transformation from anatase to rutile. The catalyst synthesized via the hydrothermal route of TiO_2 xerogel in the low concentration hydrochloric acid solution(Ti-HCl-0.15)had the highest photocatalytic activity than the catalysts obtained in the other two acid solutions. The effects of the different acids were discussed in terms of acid strength, chelating effect and the thermal stability of the adsorbed acidic anions.TiO_2 nanoparticles(NPs)were prepared via the hydrothermal route of TiO_2 xerogel in nitric acid, hydrochloric acid and acetic acid. The physico-chemical properties of the powders were characterized by X-ray diffraction(XRD)and N_2 adsorption desorption techniques. The effects of the different acids on the structure(crystal phase)and texture(primary particle size and porosity)of the TiO_2 powders were explored. Results indicated that acetic acid facilitated the formation and stability of pure anatase phase. On the other hand, nitric acid and hydrochloric acid led to the transformation from anatase to rutile. The catalyst synthesized via the hydrothermal route of TiO_2 xerogel in the low concentration hydrochloric acid solution(Ti-HCl-0.15)had the highest photocatalytic activity than the catalysts obtained in the other two acid solutions. The effects of the different acids were discussed in terms of acid strength, chelating effect and the thermal stability of the adsorbed acidic anions.

关 键 词：TiO2 XEROGEL HYDROTHERMAL ANATASE 

分 类 号：TQ134.11[化学工程—无机化工] O643.36[理学—物理化学]